Cataclysm....the failed to produced promised raids, and DS was a fairly disjointed and confusing raid, that seemed to be made up of the scraps from the abyssal maw raid. Also we never really got to fight Deathwing. Plus, even though I'm horde, Worgen can't be shaman, and that is just crazy. I mean shaman are all about wolves and worgen are WOLF PEOPLE, and that was the biggest disappointment

Cata. So much of it felt rushed. The reusing of old content instead of making new content. The lack of anything to do at max level. The whole 'hopping though portals into different zones' aspect, and the overall story and character development for several lore characters was off.

Not too shocking to see Cata pulling ahead quickly. Honestly, I think 75% of Cata's problems were simply that they sank so freakin' much of their resources into redoing Azeroth, that when they got to the actual content for the expansion left they were forced to scrape together just enough to be satisfactory. It may very well have been the weakest anyway, based on a rather poor final raid tier and confused identity (expansions w/o their own continent just don't make sense), but it sealed the deal by a mile, for me and a lot of others, when they simultaneously wasted so much effort on an excessive overhaul of a dated, but still perfectly functional, Azeroth. Imagine how improved the expansion might have been if they took 50% of that 1-60 effort and added it to 80-85 content. Guess we'll never know, but it seems like the answer in hind sight, and Blizz has pretty much concluded the same thing at this point.

Cata. So much of it felt rushed. The reusing of old content instead of making new content. The lack of anything to do at max level. The whole 'hopping though portals into different zones' aspect, and the overall story and character development for several lore characters was off.